Hermann wiedling



H. WIEDLINGEy DIEEEEENTIAL VALVE.

Patented Aug. Z4, 1886.

(No Model.)

Nov. 347,856.

UNITED STATES PATENT OFFICE.

HERMANN WIEDLING, OF NEIV YORK, N. Y., ASSIGNOR, BY DIRECT AND MESN EPLACE.

ASSIGNMENTS, TO THE VIEDLING MOTOR COMPANY, OF SAME DIFFERENTIAL VALVE.

SPECIFICATION forming part of Letters Patent No. 347,856, dated August24, 1886.

A pplication filed September 10,1885. Serial No. 176.660.

To all whom it may concern:

Be it known that L'HERMANN WIEDLING, a citizen of the Empire of Germany,residing at the city, county, and State of New York, have inventedcertain new and useful Improvements in Differential Valves, of which thefollowing is a specification.

My invention relates to disk-valves which are operated by pistonsconnected thereto and which are moved by the difference of pressurethereon, produced through secondary valves in connection with saidpiston.

In the drawings, Figure 1 is a longitudinal sectional View of myinvention, and Figs. 2, 3, and 4 are longitudinal sectional views ofvarious modifications thereof.

Fig. 1 shows the dislcvalve 1, which is connected with the piston 2,situated in the valvecasing 3.

4 is the inlet-pipe, which opens into the space 5 between the disk-valve1 and its piston 2. The latter is movable in the pistonchamber 6, and isconnected by means ot' the neck 7 with the disk-valve 1.

IVithin the neck 7 is the hollow valve-chamber 8, wherein is theslide-valve 9, which can be moved by the rod 10, passing out through astut'iingibox, 11.

12 is a channel from the space 5 into the space 8, and 13 is a channelwhich serves as an outlet from space or chamber 8 into outletpipe 14.

' In the ligurcs the valve 9 is shown in a central position, where itcovers both the channels 12 and 13. Vhen it is moved by means of thevalve-rod in the direction of the arrow, it will openthe channel 13 andallow the duid to escape from chamber 8 and space 6, whereby thepressure above the pistou 2 will be so much reduced that the piston 2will be lifted by the full pressure below it in space 5, thereby openingthe valve 1. If the pressnre in space 6 is reduced more than isnecessary to lift the piston 2 and valve 1, they will be moved up, whilethe secondary valve 9 remains stationary untilthe channel 12 will passabove the top of valve 9, when pressure will be admitted through-thechannel 12 into the (No model.)

chambers 8 and 6 until the pressure therein is raised to a point wherethe piston 2 and valve 1 will be kept balanced above the seat of thevalve 1, the distance being dependent upon the stroke of the secondaryvalve 9. If, when the valve 1 is in this position, the valve 9, by meansof the valve-rod 10, is moved in a direction opposite to that of thearrow, the

channel 12 will be thereby opened, and the full pressure therebyadmittedinto the chambers 8 and 6, which will drive the valve 1 to itsseat. In the construction shown in this figure the main'valve 1 will healways moved -into the direction of the movement of its secondary valve9that is, if the movement of the valve 9 be up, the valve 1 will beraised also, whereas if the movement of the valve 9 is downward thevalve 1 will be closed.

The construction shown in Fig. 2 is so far diiferent from that justexplained in Fig. 1 that the motion of the main valve 15 is oppon siteto that of the secondary valve 16. To obtain this result,the piston 17has again a valvechamber, 1S, in which is the secondary valve 16; butthe inlet-channel 20 is below the outlet-channel 19, so that the valve16 must be movedin the direction of the arrow, which is opposite to thatshown in Fig. 1, to open the outlet-channel 19 and thereby the valve 15.If, by means of the rod 21,the valve 16 is moved so as to open thechannel 19 so much that the difference of pressure will move the piston17, and with it the valve 15, the channel 19 will be opened'still moreby this latter movement and the difference of pressure on the piston 17increased,so that it will give the main valve its full opening at once.Likewise, if the valve 16 is moved in the opposite direction to that ofthe arrow, the outlet-channel 19 will be closed and the inlet-channel 20opened, and thereby'r the pressure on top of the piston 17 increased,and the piston 17, with the main valve l5, will be moved so as to closethe latter, by which motion the opening of the inlet- 'channel 20 willbe increased and completed,so

that the main valve 15, by meansoi' the increasing pressure, will beclosed rapidly and at once.

Fig. 3 represents a section of the valve-ch amber 22, with the mainvalve 23 and its piston 24, which slides in the piston-chamber 25. Thepiston 24 is connected with the valve 23 by a neck, through which ischannel 30. This channel 3() may be closed by means of the secondarydisk-valve 26, which is moved by the valve-rod 27 passing through thestuffingbox 28.

In the side of the chamber 25 is a recess, 29, the function of whichwill be hereinafter more particularly described.

\Vl1cn the parts are in the position shown in Fig. 3,'*if the disk-valve26 is raised, the uid in the space 25 will llow out through the channel30, thus lowering the pressure in space 25, when the piston 24 will beraised by the pressure in the chamber 31, thus opening the valve 23. Asthe piston 24 rises its lower edge will pass above the lower edge of therecess 29, which will allow Vthe fluid to escape from the chamber 31through the recess 29 into the space 25. The channel 29 is much smallerthan the channel 30, and hence the speed of the [luid which movesthrough said channel 29 into space 25 islnuch greater in said channelthan the speed of the lluid which ows through the channel 30. Hence thedifference between the pressure in space 31 and that in 25 is unichgreater than the difference between the pressure in space 25 and that inthe outlet-pipe 32, so that the piston 24 will continue to be lifted,and if, while being so lifted,

the motion ofthe valve 26 is stopped, when the piston 24 has advanced toa point where the channel 30 is partially closed by the valve 26, itwill remain stationary when the opening through the channel 30 has beenreduced to such dimensions that the difference between the pressure in31 and that in 25 will only exceed the difference in pressure between 25and 32 suiliciently to hold the piston 24 and valve 23 in place. If,then, the rod 27 is moved downward in the opposite direction to thearrow, the valve 26 will be closed, or nearly so, and the full pressurefrom chamber 31, being admitted into chamber 25 through channel 29, willdrive down the piston 24 and valve 23 with a speed dependent 011 thespeed of the rod 27 ot' secondary valve 26, for it is evident that thedifference in pressure between space 31 and that of space 25 would beincreased if the piston 24 were to move with a greater speed than thatofthe secondary valve 26.

In the construction already described the opening or closing of theinlet and outlet channels of the secondary valve is more or lessdependent on and governed by the motion of' the main piston and valve.

Fig. 4 represents a longitudinal section of a device in which the motionof the main piston and valve does not have any effect on the opening orclosing of the secondary valvechannels. In this figure, 34 is thevalve-chamber, having thepiston-chamber 35 for the piston 36 of the maindisk-valve 37. rlhe massive secondary piston-valve 38 closes, when inits central position, both the inlet-channel 39 and the outlet-channel40 of the secondary valve, and is moved by the rod 41. If the rod 41 ismoved in the direction of the arrow, the outlet-channel 40 will beopened and all the liquid under pressure let out of the piston-cham ber35 through the channel4() as piston 36 rises,where by the valve 37 willbe at once fully opened, and as the movement ofthe valve 37 is substantially at right angles-to the movement of the valve 38, the positionof the latter relative to its inlet and outlet channels will notpractically be changed by the movement of the valve 37. This4 remainstrue when the valve 38 is' pushed in so as to close thechannel 40 andopen' the channel 39, when the full force, being at once admitted intothe chamber 35, will 'drive down the piston 36 and at once close thevalve 37 Having thus described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. The combination, with a main valvehaving ports therein, of asecondary valve adapted to govern said ports, but which secondary valveis not moved by the movement of the main valve, substantially asdescribed.

2. The combination of the casing 3, the main valve 1, provided withports 12 13 therein, and the secondary valve 9, substantially as and forthe purposes described.

A valve-casing provided with a valveseat, a pistoirchamber and a channelin the side of the pistonchamber, a disk-valve therein, a pistonattached thereto to operate the same, a channel through said piston anddiskvalve, and a small secondary disk-valve to control the flow of fluidthrough said last` named channel, substantially as described.

HERMANN VIEDLlNG. titnesses:

JAMES P. Fos'rnn, MIRoN WINsLow.

